CN113689964B - Main heat-waste heat integrated heat exchanger of small nuclear reactor - Google Patents

Main heat-waste heat integrated heat exchanger of small nuclear reactor Download PDF

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CN113689964B
CN113689964B CN202111007621.9A CN202111007621A CN113689964B CN 113689964 B CN113689964 B CN 113689964B CN 202111007621 A CN202111007621 A CN 202111007621A CN 113689964 B CN113689964 B CN 113689964B
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heat
heat exchanger
coolant
loop coolant
waste heat
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CN113689964A (en
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张大林
贠世昌
李新宇
周星光
王成龙
田文喜
秋穗正
苏光辉
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Xian Jiaotong University
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Xian Jiaotong University
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    • G—PHYSICS
    • G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
    • G21C—NUCLEAR REACTORS
    • G21C15/00—Cooling arrangements within the pressure vessel containing the core; Selection of specific coolants
    • G21C15/02—Arrangements or disposition of passages in which heat is transferred to the coolant; Coolant flow control devices
    • G21C15/12—Arrangements or disposition of passages in which heat is transferred to the coolant; Coolant flow control devices from pressure vessel; from containment vessel
    • G—PHYSICS
    • G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
    • G21C—NUCLEAR REACTORS
    • G21C15/00—Cooling arrangements within the pressure vessel containing the core; Selection of specific coolants
    • G21C15/02—Arrangements or disposition of passages in which heat is transferred to the coolant; Coolant flow control devices
    • G21C15/14—Arrangements or disposition of passages in which heat is transferred to the coolant; Coolant flow control devices from headers; from joints in ducts
    • G—PHYSICS
    • G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
    • G21C—NUCLEAR REACTORS
    • G21C15/00—Cooling arrangements within the pressure vessel containing the core; Selection of specific coolants
    • G21C15/18—Emergency cooling arrangements; Removing shut-down heat
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D7/00—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
    • F28D7/0066—Multi-circuit heat-exchangers, e.g. integrating different heat exchange sections in the same unit or heat-exchangers for more than two fluids
    • G—PHYSICS
    • G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
    • G21C—NUCLEAR REACTORS
    • G21C1/00—Reactor types
    • G21C1/32—Integral reactors, i.e. reactors wherein parts functionally associated with the reactor but not essential to the reaction, e.g. heat exchangers, are disposed inside the enclosure with the core
    • G—PHYSICS
    • G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
    • G21D—NUCLEAR POWER PLANT
    • G21D1/00—Details of nuclear power plant
    • G21D1/02—Arrangements of auxiliary equipment
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D7/00—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
    • F28D7/16—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being arranged in parallel spaced relation
    • G—PHYSICS
    • G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
    • G21C—NUCLEAR REACTORS
    • G21C15/00—Cooling arrangements within the pressure vessel containing the core; Selection of specific coolants
    • G21C15/24—Promoting flow of the coolant
    • G21C15/243—Promoting flow of the coolant for liquids
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E30/00—Energy generation of nuclear origin
    • Y02E30/30—Nuclear fission reactors

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • High Energy & Nuclear Physics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)

Abstract

The invention discloses a main heat-waste heat integrated heat exchanger of a small nuclear reactor, which comprises three fluid areas: a shell side primary loop coolant area, a tube side main heat transmission secondary loop area and a tube side waste heat discharge loop coolant area; the primary loop coolant flows through the shell side from top to bottom, the secondary loop coolant and the waste heat discharge loop coolant flow through the tube side from top to bottom, the tube bundle is divided into an inner concentric circular area and an outer concentric circular area, the inner tube bundle discharges the loop coolant through waste heat, and the outer tube bundle discharges the secondary loop coolant through the secondary loop coolant; the coolant of the secondary loop and the residual heat removal loop exchanges heat with the coolant of the primary loop in a compact space, so that the heat exchange efficiency is improved; the shell side coolant and the tube side coolant perform countercurrent heat exchange, so that the pressure drop and the local thermal stress are reduced; the second loop and the waste heat discharge loop flow in the same direction, so that the flow-induced vibration is favorably inhibited; the invention has compact structure, small volume and high heat exchange efficiency, and is suitable for the integrated design of the main heat exchanger and the waste heat discharge system heat exchanger of various small nuclear reactors.

Description

一种小型核反应堆主热-余热一体式换热器A small nuclear reactor main heat-waste heat integrated heat exchanger

技术领域technical field

本发明属于先进核能开发技术领域，具体涉及一种小型核反应堆主热-余热一体式换热器。The invention belongs to the technical field of advanced nuclear energy development, and in particular relates to a main heat-waste heat integrated heat exchanger of a small nuclear reactor.

背景技术Background technique

为匹配小型核反应堆具有体积小、重量轻、成本低等优势，亟待开发相应的小型核反应堆主热和余热换热器，确保反应堆在正常停堆和事故工况下有效导出衰变热，同时具有足够小的体积适应反应堆内部狭窄的空间。然而通常这两类换热器相互独立工作，对减小体积提出了较大挑战。综上，需要对小型核反应堆的主热和余热换热器进行紧凑一体化设计，既不能占用太大体积，也应保证换热强度，并尽量减少热应力。因此，研发适用于小型核反应堆的主热-余热一体式换热器，是反应堆工程的必要环节，有助于推动我国自主掌握小型核反应堆设计技术的进程。In order to match the advantages of small nuclear reactors such as small size, light weight, and low cost, it is urgent to develop corresponding heat exchangers for the main heat and waste heat of small nuclear reactors to ensure that the reactor can effectively dissipate the decay heat under normal shutdown and accident conditions, and at the same time have a sufficiently small The volume fits into the narrow space inside the reactor. However, usually these two types of heat exchangers work independently of each other, which poses a great challenge to reduce the volume. To sum up, it is necessary to carry out a compact and integrated design for the main heat and waste heat exchangers of small nuclear reactors, which should neither occupy too much volume, but also ensure the heat exchange intensity and minimize thermal stress. Therefore, the research and development of the main heat-waste heat integrated heat exchanger suitable for small nuclear reactors is a necessary part of reactor engineering, which will help promote the process of my country's independent mastery of small nuclear reactor design technology.

发明内容Contents of the invention

为了克服上述现有技术存在的问题，本发明公开了一种小型核反应堆主热-余热一体式换热器，为反应堆和余排系统的设计提供设备基础。In order to overcome the above-mentioned problems in the prior art, the present invention discloses a small nuclear reactor main heat-waste heat integrated heat exchanger, which provides an equipment basis for the design of the reactor and the waste exhaust system.

为达到上述目的，本发明采用如下技术方案：To achieve the above object, the present invention adopts the following technical solutions:

一种小型核反应堆主热-余热一体式换热器，包括换热器外壳9，固定连接在换热器外壳9底部和顶部的下封头12和上封头14，位于换热器外壳9内底部中心和下封头12中心处的余热排出系统换热器入口套筒13，位于上封头14中心的余热排出系统换热器出口套筒15，位于换热器外壳9内的管束8，两边的管由上管板10和下管板11固定，中间的管由上管板10和余热排出系统换热器入口套筒13固定；A small nuclear reactor main heat-waste heat integrated heat exchanger, including a heat exchanger shell 9, a lower head 12 and an upper head 14 fixedly connected to the bottom and top of the heat exchanger shell 9, located in the heat exchanger shell 9 The inlet sleeve 13 of the waste heat removal system heat exchanger at the center of the bottom and the center of the lower head 12, the outlet sleeve 15 of the heat exchanger of the waste heat removal system at the center of the upper head 14, the tube bundle 8 located in the heat exchanger shell 9, The tubes on both sides are fixed by the upper tube plate 10 and the lower tube plate 11, and the middle tube is fixed by the upper tube plate 10 and the heat exchanger inlet sleeve 13 of the waste heat removal system;

换热器内有三个流体区：壳侧一回路冷却剂区A、管侧主热传输二回路冷却剂区B和管侧余热排出回路冷却剂区C；壳侧一回路冷却剂区A是由位于换热器外壳9内侧与余热排出系统换热器入口套筒13外侧、管束8外侧区域构成的一回路冷却剂流动空间；管侧主热传输二回路冷却剂区B是由位于换热器外壳9与余热排出系统换热器入口套筒13之间的管束8内侧、位于下封头12的环形二回路冷却剂入口腔室和位于上封头14的环形二回路冷却剂出口腔室构成的二回路冷却剂流动空间；管侧余热排出回路冷却剂区C由余热排出系统换热器入口套筒13内侧、余热排出系统换热器出口套筒15内侧和与其连接的管束8内侧构成的余热排出回路冷却剂流动空间；There are three fluid areas in the heat exchanger: the shell side primary circuit coolant area A, the tube side main heat transfer secondary circuit coolant area B and the tube side waste heat discharge circuit coolant area C; the shell side primary circuit coolant area A is composed of The primary circuit coolant flow space is formed by the inner side of the heat exchanger shell 9, the outer side of the heat exchanger inlet sleeve 13 of the waste heat removal system, and the outer area of the tube bundle 8; The inside of the tube bundle 8 between the shell 9 and the heat exchanger inlet sleeve 13 of the waste heat removal system, the annular secondary circuit coolant inlet chamber located at the lower head 12 and the annular secondary circuit coolant outlet chamber located at the upper head 14 The secondary circuit coolant flow space; the tube side waste heat discharge circuit coolant area C is composed of the inner side of the heat exchanger inlet sleeve 13 of the waste heat removal system, the inner side of the heat exchanger outlet sleeve 15 of the waste heat removal system and the inner side of the tube bundle 8 connected thereto Coolant flow space of waste heat discharge circuit;

壳侧一回路冷却剂区A位于管束8所在区域上部和下部的换热器外壳9同一侧分别开设有一回路冷却剂并联入口窗1和一回路冷却剂并联出口窗2，壳侧一回路冷却剂区A位于壳侧一回路冷却剂并联入口窗1下部横向设置有壳侧一回路冷却剂流量分配孔板7；管侧主热传输二回路冷却剂区B位于下封头12和上封头14的对侧分别开设有二回路冷却剂入口3和二回路冷却剂出口4；余热排出系统换热器入口套筒13的底部和余热排出系统换热器出口套筒15的顶部分别设置余热排出回路冷却剂入口5和余热排出回路冷却剂出口6；The shell-side primary circuit coolant area A is located on the same side of the heat exchanger shell 9 above and below the area where the tube bundle 8 is located. Zone A is located at the primary circuit coolant on the shell side and is connected in parallel with the inlet window 1. A flow distribution orifice plate 7 for the primary circuit coolant on the shell side is arranged laterally at the lower part; the main heat transfer secondary circuit coolant zone B on the tube side is located at the lower head 12 and the upper head 14 The two-circuit coolant inlet 3 and the secondary-circuit coolant outlet 4 are respectively provided on the opposite side; the bottom of the heat exchanger inlet sleeve 13 of the waste heat discharge system and the top of the heat exchanger outlet sleeve 15 of the waste heat discharge system are respectively provided with a waste heat discharge circuit Coolant inlet 5 and coolant outlet 6 of waste heat removal circuit;

一回路冷却剂进入一回路冷却剂并联入口窗1后，经过壳侧一回路冷却剂流量分配孔板7后放热，最后在一回路冷却剂并联出口窗2汇集并流出；二回路冷却剂进入二回路冷却剂入口3后，经过下管板11分配流量，后在管侧吸热，最后在二回路冷却剂出口4汇集并流出；余热排出回路冷却剂进入余热排出回路冷却剂入口5经过余热排出换热器入口套筒13进入管束8吸热，最后在余热排出系统换热器出口套筒15汇集并由余热排出回路冷却剂出口6流出。After the primary circuit coolant enters the primary circuit coolant parallel inlet window 1, it passes through the primary circuit coolant flow distribution orifice 7 on the shell side and releases heat, and finally gathers and flows out at the primary circuit coolant parallel outlet window 2; the secondary circuit coolant enters After the secondary circuit coolant inlet 3, the flow is distributed through the lower tube plate 11, and then absorbs heat at the tube side, and finally gathers and flows out at the secondary circuit coolant outlet 4; the coolant of the waste heat discharge circuit enters the waste heat discharge circuit coolant inlet 5 and passes through the waste heat The discharge heat exchanger inlet sleeve 13 enters the tube bundle 8 to absorb heat, and finally gathers at the heat exchanger outlet sleeve 15 of the waste heat removal system and flows out from the coolant outlet 6 of the waste heat discharge circuit.

和现有技术相比较，本发明具备如下优点：Compared with the prior art, the present invention has the following advantages:

二回路和余热排出回路同时在紧凑空间内与一回路冷却剂换热，提高了换热效能。The secondary circuit and the waste heat discharge circuit exchange heat with the primary circuit coolant in a compact space at the same time, which improves the heat exchange efficiency.

壳侧一回路冷却剂、二回路冷却剂与管侧冷却剂逆流换热，有利于降低压降和局部热应力。The coolant of the primary circuit on the shell side, the coolant of the secondary circuit and the coolant on the tube side exchange heat in countercurrent, which is beneficial to reduce the pressure drop and local thermal stress.

二回路冷却剂和余热排出回路冷却剂同向流动，有利于抑制流致振动。The secondary circuit coolant and the waste heat discharge circuit coolant flow in the same direction, which is beneficial to suppress flow-induced vibration.

主热传输与余热传输一体化设计有利于核反应堆小型化。The integrated design of main heat transfer and waste heat transfer is conducive to the miniaturization of nuclear reactors.

附图说明Description of drawings

图1是本发明一种小型核反应堆主热-余热一体式换热器示意图。Fig. 1 is a schematic diagram of a main heat-waste heat integrated heat exchanger of a small nuclear reactor according to the present invention.

图2为图1沿D-D向的剖视图。Fig. 2 is a cross-sectional view along the D-D direction of Fig. 1 .

具体实施方式detailed description

下面结合附图，以小型氟盐冷却高温堆为例，对本发明作详细的说明：Below in conjunction with accompanying drawing, take the small fluorine salt cooling high temperature reactor as example, the present invention is described in detail:

如图1和图2所示，本发明小型核反应堆主热-余热一体式换热器，包括一回路冷却剂并联入口窗1、一回路冷却剂并联出口窗2、二回路冷却剂入口3、二回路冷却剂出口4、余热排出回路冷却剂入口5、余热排出回路冷却剂出口6、壳侧一回路冷却剂流量分配孔板7、管束8、换热器外壳9、上管板10、下管板11、下封头12、余热排出系统换热器入口套筒13、上封头14和余热排出系统换热器出口套筒15。As shown in Fig. 1 and Fig. 2, the main heat-waste heat integrated heat exchanger of the small nuclear reactor of the present invention includes a primary circuit coolant parallel inlet window 1, a primary circuit coolant parallel outlet window 2, a secondary circuit coolant inlet 3, two Circuit coolant outlet 4, waste heat discharge circuit coolant inlet 5, waste heat discharge circuit coolant outlet 6, shell side primary circuit coolant flow distribution orifice plate 7, tube bundle 8, heat exchanger shell 9, upper tube plate 10, lower tube Plate 11 , lower head 12 , inlet sleeve 13 of heat exchanger of waste heat removal system, upper head 14 and outlet sleeve 15 of heat exchanger of waste heat removal system.

所述小型核反应堆主热-余热一体式换热器，其管束8采用三角形排布，一部分管由上管板10和下管板11固定，另一部分管由上管板10和余排换热器入口套筒13固定。In the small nuclear reactor main heat-waste heat integrated heat exchanger, the tube bundles 8 are arranged in a triangle, a part of the tubes are fixed by the upper tube plate 10 and the lower tube plate 11, and the other part of the tubes are fixed by the upper tube plate 10 and the residual heat exchanger. The inlet sleeve 13 is fixed.

换热器内有三个流体区：壳侧一回路冷却剂区A、管侧主热传输二回路冷却剂区B和管侧余热排出回路冷却剂区C；壳侧一回路冷却剂区A是由位于换热器外壳9内侧与余热排出系统换热器入口套筒13外侧、管束8外侧区域构成的一回路冷却剂流动空间；管侧主热传输二回路冷却剂区B是由位于换热器外壳9与余热排出系统换热器入口套筒13之间的管束8内侧、位于下封头12的环形二回路冷却剂入口腔室和位于上封头14的环形二回路冷却剂出口腔室构成的二回路冷却剂流动空间；管侧余热排出回路冷却剂区C由余热排出系统换热器入口套筒13内侧、余热排出系统换热器出口套筒15内侧和与其连接的管束8内侧构成的余热排出回路冷却剂流动空间。There are three fluid areas in the heat exchanger: the shell side primary circuit coolant area A, the tube side main heat transfer secondary circuit coolant area B and the tube side waste heat discharge circuit coolant area C; the shell side primary circuit coolant area A is composed of The primary circuit coolant flow space is formed by the inner side of the heat exchanger shell 9, the outer side of the heat exchanger inlet sleeve 13 of the waste heat removal system, and the outer area of the tube bundle 8; The inside of the tube bundle 8 between the shell 9 and the heat exchanger inlet sleeve 13 of the waste heat removal system, the annular secondary circuit coolant inlet chamber located at the lower head 12 and the annular secondary circuit coolant outlet chamber located at the upper head 14 The secondary circuit coolant flow space; the tube side waste heat discharge circuit coolant area C is composed of the inner side of the heat exchanger inlet sleeve 13 of the waste heat removal system, the inner side of the heat exchanger outlet sleeve 15 of the waste heat removal system and the inner side of the tube bundle 8 connected thereto Excess heat is exhausted from the loop coolant flow space.

壳侧一回路冷却剂区A位于管束8所在区域上部和下部的换热器外壳9同一侧分别开设有一回路冷却剂并联入口窗1和一回路冷却剂并联出口窗2，壳侧一回路冷却剂区A位于壳侧一回路冷却剂并联入口窗1下部横向设置有壳侧一回路冷却剂流量分配孔板7；管侧主热传输二回路冷却剂区B位于下封头12和上封头14的对侧分别开设有二回路冷却剂入口3和二回路冷却剂出口4；余热排出系统换热器入口套筒13的底部和余热排出系统换热器出口套筒15的顶部分别设置余热排出回路冷却剂入口5和余热排出回路冷却剂出口6。The shell-side primary circuit coolant area A is located on the same side of the heat exchanger shell 9 above and below the area where the tube bundle 8 is located. Zone A is located at the primary circuit coolant on the shell side and is connected in parallel with the inlet window 1. A flow distribution orifice plate 7 for the primary circuit coolant on the shell side is arranged laterally at the lower part; the main heat transfer secondary circuit coolant zone B on the tube side is located at the lower head 12 and the upper head 14 The two-circuit coolant inlet 3 and the secondary-circuit coolant outlet 4 are respectively provided on the opposite side; the bottom of the heat exchanger inlet sleeve 13 of the waste heat discharge system and the top of the heat exchanger outlet sleeve 15 of the waste heat discharge system are respectively provided with a waste heat discharge circuit Coolant inlet 5 and waste heat removal circuit coolant outlet 6.

如图1所示，一回路冷却剂进入一回路冷却剂并联入口窗1后，经过壳侧一回路冷却剂流量分配孔板7后放热，最后在一回路冷却剂并联出口窗2汇集并流出；二回路冷却剂进入二回路冷却剂入口3后，经过下管板11分配流量，后在管侧吸热，最后在二回路冷却剂出口4汇集并流出；余热排出回路冷却剂进入余热排出回路冷却剂入口5经过余热排出换热器入口套筒13进入管束8吸热，最后在余热排出系统换热器出口套筒15汇集并由余热排出回路冷却剂出口6流出。As shown in Figure 1, after the primary circuit coolant enters the primary circuit coolant parallel inlet window 1, it passes through the primary circuit coolant flow distribution orifice 7 on the shell side and releases heat, and finally gathers and flows out at the primary circuit coolant parallel outlet window 2 ; After the secondary circuit coolant enters the secondary circuit coolant inlet 3, it passes through the lower tube plate 11 to distribute the flow, then absorbs heat at the tube side, and finally gathers and flows out at the secondary circuit coolant outlet 4; the waste heat discharge circuit coolant enters the waste heat discharge circuit The coolant inlet 5 enters the tube bundle 8 to absorb heat through the inlet sleeve 13 of the waste heat discharge heat exchanger, and finally gathers at the heat exchanger outlet sleeve 15 of the waste heat discharge system and flows out from the coolant outlet 6 of the waste heat discharge circuit.

管束8的数量和尺寸取决于具体工况，此处管束8数目和尺寸未定。The number and size of the tube bundles 8 depend on specific working conditions, and the number and size of the tube bundles 8 are undetermined here.

以上内容是结合具体的优选实施方式对本发明所作的进一步详细说明，不能认定本发明的具体实施方式仅限于此，对于本发明所属技术领域的普通技术人员来说，在不脱离本发明构思的前提下，还可以做出若干简单的推演或替换，都应当视为属于本发明由所提交的权利要求书确定专利保护范围。The above content is a further detailed description of the present invention in conjunction with specific preferred embodiments. It cannot be determined that the specific embodiments of the present invention are limited thereto. Under the circumstances, some simple deduction or replacement can also be made, all of which should be regarded as belonging to the scope of patent protection determined by the submitted claims of the present invention.

Claims (2)

1. The utility model provides a main heat-waste heat integral type heat exchanger of small-size nuclear reactor which characterized in that: the waste heat recovery device comprises a heat exchanger shell (9), a lower seal head (12) and an upper seal head (14) which are fixedly connected to the bottom and the top of the heat exchanger shell (9), a waste heat discharge system heat exchanger inlet sleeve (13) which is positioned at the center inside the heat exchanger shell (9) and the center of the lower seal head (12), a waste heat discharge system heat exchanger outlet sleeve (15) which is positioned at the center of the upper seal head (14), a tube bundle (8) which is positioned in the heat exchanger shell (9), wherein the middle tube bundle is fixed by an upper tube plate (10) and the waste heat discharge system heat exchanger inlet sleeve (13), and the surrounding tube bundles are fixed by an upper tube plate (10) and a lower tube plate (11);
there are three fluid zones within the heat exchanger: a shell side primary loop coolant area (A), a tube side main heat transfer secondary loop coolant area (B) and a tube side waste heat discharge loop coolant area (C); the shell side primary loop coolant area (A) is a primary loop coolant flowing space formed by the area which is positioned on the inner side of the heat exchanger shell (9), the outer side of the waste heat discharge system heat exchanger inlet sleeve (13) and the outer side of the tube bundle (8); the tube side main heat transmission two-loop coolant area (B) is a two-loop coolant flowing space which is formed by a tube bundle (8) positioned between a heat exchanger shell (9) and a waste heat discharge system heat exchanger inlet sleeve (13), an annular two-loop coolant inlet chamber positioned on a lower end enclosure (12) and an annular two-loop coolant outlet chamber positioned on an upper end enclosure (14); the pipe side residual heat removal loop coolant area (C) is a residual heat removal loop coolant flowing space formed by the inner side of an inlet sleeve (13) of a residual heat removal system heat exchanger, the inner side of an outlet sleeve (15) of the residual heat removal system heat exchanger and the inner side of a pipe bundle (8) connected with the inner side of the residual heat removal system heat exchanger;
a shell side primary loop coolant area (A) is positioned on the same side of a heat exchanger shell (9) on the upper portion and the lower portion of an area where a tube bundle (8) is positioned, a primary loop coolant parallel inlet window (1) and a primary loop coolant parallel outlet window (2) are respectively arranged on the same side of the shell (9), and a shell side primary loop coolant flow distribution pore plate (7) is transversely arranged on the lower portion of the shell side primary loop coolant parallel inlet window (1); a main heat transmission two-loop coolant area (B) on the tube side is positioned on the opposite side of the lower end enclosure (12) and the upper end enclosure (14) and is respectively provided with a two-loop coolant inlet (3) and a two-loop coolant outlet (4); the bottom of the waste heat discharge system heat exchanger inlet sleeve (13) and the top of the waste heat discharge system heat exchanger outlet sleeve (15) are respectively provided with a waste heat discharge loop coolant inlet (5) and a waste heat discharge loop coolant outlet (6);
after entering a primary circuit coolant parallel inlet window (1), a primary circuit coolant flows through a shell side primary circuit coolant flow distribution pore plate (7) to release heat, and finally is collected and flows out of a primary circuit coolant parallel outlet window (2); after entering a secondary loop coolant inlet (3), the secondary loop coolant distributes flow through a lower tube plate (11), absorbs heat at the tube side, and finally is collected and flows out at a secondary loop coolant outlet (4); the residual heat discharge loop coolant enters a residual heat discharge loop coolant inlet (5), enters a tube bundle (8) through a residual heat discharge heat exchanger inlet sleeve (13) to absorb heat, and finally is collected at a residual heat discharge system heat exchanger outlet sleeve (15) and flows out from a residual heat discharge loop coolant outlet (6).
2. The integrated heat exchanger of main heat and residual heat of small nuclear reactor as claimed in claim 1, wherein: the tube bundles (8) are arranged in a triangular shape.
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